Enhanced activation of ultrasonic pre-treated softwood biochar for efficient heavy metal removal from water

Biochar for the removal of contaminants from soil and water: a review

“…The main benefits of biochar-based materials lie in their highly porous, large surface area, better ion exchange capacity, and plentiful functional groups. Attempts have been made to remove pollutants from aqueous solutions using different types of biochar material, including wheat straw biochar (Cui et al 2021), raw jujube seed biochar (Gayathri et al 2021), Douglas fir biochar (Herath et al 2021), pulp mill sludge biochar (Islam et al 2021a), pinewood biochar (Zhao et al 2021a), poplar sawdust biochar (Cheng et al 2021c), coconut shell biochar (Wu et al 2021c), and softwood biochar (Peter et al 2021). Research has attempted to elevate the removal capacity of biocharbased materials to remove pollutants via surface modification and impregnation through the use of various media, such as iron-based materials (Liu et al 2021b;Xu et al 2021a;Yu et al 2021c), oxide materials (Chen et al 2021a;Rahman et al 2021), organic functional groups (Liu et al 2022;Wu et al 2021a), and inorganic compounds (Herath et al 2021;Zhong et al 2021).…”

Cleaner technologies to combat heavy metal toxicity

“…In such a scenario, the availability of nanoparticles and their composites with better adsorption capacities help to overcome the discrepancy associated with unmodified natural adsorbents (Soni et al, 2020). The activation of soft wood chips or biochars by ultrasound and alkali treatment enhanced the heavy metal removal by 22 times than nonactivatedbiochars, signifying how a simple modification could increase adsorptive ability of heavy metals in some cases (Peter et al, 2021). The use of still new adsorbents such as zeoliticimidazolate framework (ZIF-8) with better adsorption efficiencies could be promising in heavy metal removal from aqueous solutions in near future .…”

Screening the functions of modified rice straw biochar for adsorbing manganese from drinking water

“… 20 Peter et al . 21 reported that NaOH-treated softwood biochar could homogenously distribute Na + on the surface of biochar and thereafter improved the adsorption capacity 22 times higher than that of the unmodified biochar for Cu 2+ removal. For the removal of Mn 2+ from lakes and reservoirs, limited works have been reported on the relevant issue.…”